References - Immundiagnostik Tryptophan (IDK® Tryptophan) ELISA

Hildebrand, P., Königschulte, W., Gaber, T.J., Bubenzer-Busch, S., Helmbold, K.,

       Biskup, C. S., Langen, K.J., Fink, G.R., Zepf, F. D (2015). Effects of dietary tryptophan and phenylalanine-  

       tyrosine depletion on phasic alertness in healthy adults - A pilot study. Food & nutrition research, 59:26407.

       doi:10.3402/fnr.v59.26407

Zimmer P, Schmidt ME, Prentzell MT, et al. Resistance Exercise Reduces Kynurenine Pathway Metabolites in Breast Cancer Patients Undergoing Radiotherapy. Front Oncol. 2019;9(September):1-11. doi:10.3389/fonc.2019.00962